Air quality and COVID-19https://www.eea.europa.eu/themes/air/air-quality-and-covid19/air-quality-and-covid19
The lockdown and related measures implemented by many European countries to stop the spread of COVID-19 have led to a sudden decrease in economic activities, including a drop in road transport in many cities. To assess how this has affected concentrations of air pollution, the EEA has developed a viewer that tracks the weekly and monthly average concentrations of nitrogen dioxide (NO2) and particulate matter (PM10 and PM2.5).